Unlike a pocket spring system, a Bonnell spring system uses springs that are hour-glass shaped rather than all of the same diameter. The benefits include better support for your body, more resilience and better ventilation. Our Bonnell Spring Mattress delivers all of the above with a level of comfort that surpasses expectations and a medium firmness that many Australians desire. The Mattress is constructed with layers of premium materials. A high density foam fills the inside of the mattress in between the stable Bonnell spring core while the exterior is fully wrapped with a luxurious polyester fabric. Not least, a soft quilting layer rests on top of the entire ensemble. Essentially, you get a solid mattress that retain its shape well for long-lasting use and yet comfortable to enjoy all its inherent benefits for you. The Bonnell Spring Mattress is allergy-free and treated for dust and mould resistance.